ALWAYS have a fire extinguisher on hand when working on carburetors.Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).Drain the carburetor. There should be a screw on the lower side or bottom of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well.< < READ CLOSELY > >Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine.There is a proper way to start the engine. Four controls are on your bike to assist in starting.

The choke, used when the engine is cold. Pull the red knob for choke.

The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.

The de-compression lever, always used.

The throttle, used to prime the cylinder.

Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

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Related Questions:

Check the fuel tap is turned on and that the fuel filter is clean. If this is all good, you should check that fuel is getting into the fuel reservoir on the carb. If no fuel is getting through, your fuel pump may have failed. But, as you don't say the make and model of your bike, I can't be sure.

check your spark plug to see if you have a spark if not check your spark plug cap to see if that id the reason and if its not that check your ht lead dowt it will be that but its possible then check your coil to see if theres any power coming from that . 2nd... you might be starving it from petrol remove your carb and clean it all out remove your jets and blow them to get a dirt out that is in them , then remove your petrol pipes and clean them out to prevent any blockege

carbs blocked i would say check for spark at plugs with old plug hold againist engin hold by rubber plug lead if good srark remove one plug see is it wet with petrol if so carbs fine remove all plugs and leave dry when dry run starter no plugs then replace plugs and try then

If you're getting fuel and spark, it should start assuming you also have compression. Try putting in a fresh plug; sometimes a plug will appear to have spark when you test it and wont spark under pressure.

Check fuses. Get a new spark plug then check for spark by hooking up the plug wire then hold the metal side of the plug against the cylinder. Have a friend kick the engine over while you look for spark. Remove the carb, then remove the float bowl from the bottom of the carb. Use spray carb cleaner to clean the carb. How old is the gas? Flush the tank and fill with fresh fuel if old gas is present. Please rate my answer. Thanks.

First things first .Remove your spark plugs ,Place them on the cylinders head .push the kick starter and watch t see if the plugs are sparking,and if the thev spark is strong or weak .If the plugs are sparking OK then check that you are getting petrol to them .It could be a nimber of problems wrong with your bike .You may have a fuel & air problem .or it may be that your choke unit is not closing properly when you try to start first thing .try your plugs first then the fuel ,Is your air cleaner blocked .You may have blocked jets in the carbs .